Will cucumber juice break a fast?

If you're using a true fast, adding cucumber to the water will break the fast. However, if you use the approach of imitating fasting, the answer depends on the amount of cucumber in the water. Cucumbers contain carbohydrates, which are one of the macronutrients that increase insulin. The truth is that technically cucumbers break an intermittent fast, since cucumbers contain calories.

However, the number of calories is quite small and it won't significantly affect your fast if you keep the serving size small.

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